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Titre du document / Document title

Blasting off-the-solid (BOS): a new approach

Auteur(s) / Author(s)

SINGH R. R. (1) ; ROY S. K. (1) ; RAM P. (1) ; BHATTACHARYYA M. M. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) CMRI, Dhanbad 826 001, INDE

Résumé / Abstract

Increasing average powder factor and total pull under blasting off-the-solid (BOS) are the prime necessities of the coal mining industry because of the stagnating production in BOS during the last three decades from underground coal mining. While maximum charge of 1000 g per shot hole has so far been allowed by the DGMS in degree I coal mines, only 565 g is allowed for solid blasting in higher degree gassy mines. Renovation in the technology of blasting either by enhancing charge limit per shot hole or bringing some change in the usual firing pattern of blasting-off-the-solid in underground coal mines may be two options for increasing average pull and powder factor i.e. overall productivity of the underground coal mines. Experiments in the laboratory conditions for ascertaining safe maximum charge weight of P5 explosive have indicated scope of using higher charge without impairing safety parameters to optimise production from BOS. Further studies of AGS of permitted explosive in varying laboratory conditions and coal bed confinement have shown encouraging results. Observed enhancement in AGS values of permitted explosive cartridges with increasing confinement/coal bed confinement open up the scope of use of air deck technique with plastic spacers in between the cartridges for improvement of powder factor. The authors have presented their concepts and analysed experimental data generated so far, which may be of interest to all concerned from the safety and productivity points of view. Need for more studies in these directions has been suggested to corroborate the observed results and extrapolate them for the benefit of the Indian mining industry.

Revue / Journal Title

Journal of mines, metals and fuels    ISSN  0022-2755   CODEN JMMFAM 

Source / Source

2002, vol. 50, no3, pp. 64-67 (13 ref.)

Langue / Language

Anglais

Editeur / Publisher

Books and Journals Private, Calcutta, INDE  (1959) (Revue)

Mots-clés anglais / English Keywords

sedimentary rocks

;

carbonaceous rocks

;

new methods

;

concepts

;

techniques

;

safety

;

productivity

;

technology

;

coal mines

;

production

;

coal

;

blasting

;

mining

;

Mots-clés français / French Keywords

Roche sédimentaire

;

Roche carbonée

;

Industrie minière

;

Méthode nouvelle

;

Concept

;

Technique

;

Sécurité

;

Productivité

;

Technologie

;

Mine charbon

;

Production

;

Charbon

;

Tir mine

;

Exploitation minière

;

Mots-clés espagnols / Spanish Keywords

Roca sedimentaria

;

Roca carbonosa

;

Método nuevo

;

Productividad

;

Tecnología

;

Producción

;

Carbón

;

Voladupa

;

Localisation / Location

INIST-CNRS, Cote INIST : 2867, 35400010917228.0040

Nº notice refdoc (ud4) : 13880203



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